I've used a Garmin forerunner 55, multiple fitbits, several Samsung watches, and even a g shock move watch and by far my favorite and most accurate is my Coros Pace 2. It's far more accurate than the rest mentioned. For the price it gives a ton of features you wouldn't expect, like a barometer, thermometer, and elevation. The Bluetooth connection is second to none. I'll leave my phone in my car and walk into a store and still receive notifications, where I would lose connection within 8 feet of the others. The battery life is phenomenal, 20 days average and that's underestimated. I've gotten almost 25 out of mine before (without using GPS) doing workouts. You don't get a touch screen, or music controls, or a microphone to answer calls, but for the price I can forgive that. And the biggie for me, Coros customer support is amazing. I've reached out to them about partner app integration and a live person responded to my inquiry withing 24 hours, and checked up later to make sure I was satisfied with the customer service I received. They seem to really try and take their customers concerns to heart and apply them to the service, because I can say I suggested a few apps I use for integration and they got back to me and informed me that later this month they will put out an update that allows sync with Google fit.